US20140068374A1 - Display device and method of detecting error therein - Google Patents

Display device and method of detecting error therein Download PDF

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Publication number
US20140068374A1
US20140068374A1 US13/944,083 US201313944083A US2014068374A1 US 20140068374 A1 US20140068374 A1 US 20140068374A1 US 201313944083 A US201313944083 A US 201313944083A US 2014068374 A1 US2014068374 A1 US 2014068374A1
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Prior art keywords
error
memory
display device
display
display data
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US13/944,083
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English (en)
Inventor
Seong Keun HA
Wook Lee
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HA, SEONG KEUN, LEE, WOOK
Publication of US20140068374A1 publication Critical patent/US20140068374A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2906—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using block codes
    • H03M13/2909—Product codes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller

Definitions

  • Embodiments relate to a display device and a method of detecting an error in the display device, and more particularly to a display device and a method of detecting an error in the display device.
  • Display devices in particular, liquid crystal display devices, have the characteristics of small size, light weight, and low power consumption, and have been adopted and used in not only small-sized devices such as mobile phones, personal digital assistants (PDAs), portable multimedia players (PMPs), and the like, but also middle or large-sized devices, such as monitors, TVs, and the like.
  • PDAs personal digital assistants
  • PMPs portable multimedia players
  • middle or large-sized devices such as monitors, TVs, and the like.
  • Such a display device includes a memory in which data for displaying an image is stored.
  • data for displaying an image is stored.
  • all data stored in the memory is read.
  • a considerable loss of time occurs.
  • the method may further include, before receiving display data and the first error correction code, confirming numerical data stored in the memory, changing the numerical data stored in the memory, after providing the first comparison result, and comparing the numerical data stored in the memory with the confirmed numerical data to provide a second comparison result, wherein detecting detects the error is based on the second comparison result.
  • the display device may include a display panel, and the display data may be data that is used to display an image or a picture on the display panel.
  • Generating may include generating the second CRC code in an inside of the driving IC.
  • Comparing may include comparing the first CRC code with the second CRC code in an inside of the driving IC.
  • Comparing may include inscribing the result of the comparison of the first CRC code with the second CRC code in an error inscription register as an error flag.
  • the error inscription register may be included in the memory.
  • Detecting may include confirming the error flag in the error inscription register.
  • a display device comprising a memory and a driving IC on which the memory is arranged, wherein the driving IC is configured to receive display data and a first error correction code of the display data from an outside, generate a second error correction code based on the received display data, compare the received first error correction code with the generated second error correction code to provide a first comparison result, and detect an error based on the first comparison result.
  • the numerical data may be stored in the memory, and the driving IC may be configured to change the numerical data stored in the memory based on the first comparison result, compare the numerical data stored in the memory before receiving the display data with the numerical data changed on the basis of the first comparison result, and detect the error based on the result of the comparison of the numerical data.
  • a display device includes a memory and a driving IC on which the memory is arranged, wherein display data and a first CRC (Cycle Redundancy Checking) code of the display data are stored in the memory, and the driving IC is configured to load the display data stored in the memory, generate a second CRC code of the display data, compare the first CRC code with the second CRC code, and detects the error based on the result of the comparison.
  • CRC Chip Redundancy Checking
  • the display device may further include a display panel, wherein the display data is data that is used to display an image or a picture on the display panel.
  • the driving IC may inscribe the result of the comparison of the first CRC code with the second CRC code in an error inscription register as an error flag.
  • the error inscription register may be included in the memory.
  • the driving IC may detect the error by confirming the error flag in the error inscription register.
  • FIG. 1 is a conceptual view of a display device according to an embodiment
  • FIG. 2 is a conceptual view of a driving IC of a display device according to an embodiment
  • FIG. 3 is a flowchart illustrating a method of detecting an error in a display device according to an embodiment
  • FIG. 4 is a flowchart illustrating a method of detecting an error in a display device according to an embodiment.
  • Embodiments described herein will be described referring to plan views and/or cross-sectional views by way of ideal schematic views. Accordingly, the exemplary views may be modified depending on manufacturing technologies and/or tolerances. Therefore, the embodiments are not limited to those shown in the views, but include modifications in configuration formed on the basis of manufacturing processes. Therefore, regions exemplified in figures have schematic properties and shapes of regions shown in figures exemplify specific shapes of regions of elements and not limit aspects thereof.
  • FIG. 1 is a conceptual view of a display device according to an embodiment.
  • a display device 100 may include a substrate 10 , a display panel 20 , and a driving IC 30 .
  • the display panel 20 may be arranged on the substrate 10 .
  • the substrate 10 may be a base substrate which is made of an insulating material to support the display panel 20 .
  • the substrate 10 may be made of an insulating material, such as glass or plastic.
  • the display panel 20 may be a panel that displays an image, and may be an LCD panel (Liquid Crystal Display panel), an electrophoretic display panel, an OLED panel (Organic Light Emitting Diode Panel), an LED panel, an inorganic EL panel (Electro Luminescent display panel), an FED panel (Field Emission Display panel), an SED panel (Surface-conduction Electron-emitter Display panel), or a CRT display panel (Cathode Ray Tube display panel).
  • LCD panel Liquid Crystal Display panel
  • OLED panel Organic Light Emitting Diode Panel
  • LED panel an inorganic EL panel (Electro Luminescent display panel)
  • an FED panel Field Emission Display panel
  • SED panel Surface-conduction Electron-emitter Display panel
  • CRT display panel Cathode Ray Tube display panel
  • the driving IC 30 may be arranged on the substrate 10 , and may be arranged adjacent to the display panel 20 .
  • the driving IC 30 is to apply a driving signal and/or a data signal to the display panel 20 , and may be arranged adjacent to the display panel 20 .
  • the driving IC 30 may include a gate driving IC 31 and a data driving IC 32 .
  • the gate driving IC 31 may mean an IC that applies a gate signal to the display panel 20 through a gate line of the display panel 20
  • the data driving IC 32 may means an IC that applies a data signal to the display panel 20 through a data line of the display panel 20 .
  • FIG. 1 illustrates that the driving IC 30 is divided into the gate driving IC 31 and the data driving IC 32 .
  • the gate driving IC 31 and the data driving IC 32 output different kinds of signals to the display panel 20 , but have substantially the same configuration, both of them are hereinafter defined and described as the driving IC 30 having the same configuration.
  • the driving IC 31 will be described in more detail with reference to FIG. 2 .
  • FIG. 2 is a conceptual view of the driving IC 130 of a display device according to an embodiment.
  • the driving IC 30 is illustrated as the gate driving IC 31 in FIG. 2 .
  • the driving IC 30 may include an input pad 33 , an output pad 34 , a driving circuit unit 35 , a memory 36 , and a counter (which may be included in the memory 36 ).
  • the driving circuit unit 35 may include a gate driver, a source driver, an internal voltage generation unit, and a main logic unit as non-memory semiconductor devices.
  • the memory 36 may include a volatile memory and/or a nonvolatile memory.
  • the memory 36 may include, for example, at least one register that is a volatile memory. Any one of the registers may be used as the counter.
  • the counter may store numerical data, and the driving IC 30 may change the numerical data of the counter if a specified event that satisfies a predetermined condition occurs.
  • the memory 36 may include, for example, an OTP (One Time Programmable) memory or a MTP (Multi Time Programmable) memory, which is a nonvolatile memory.
  • OTP One Time Programmable
  • MTP Multi Time Programmable
  • the input pad 33 may be a pad for receiving an input signal from an external driving circuit unit (not illustrated) that controls the driving IC 30 .
  • the input signal received through the input pad 33 may be transferred to the driving circuit unit 35 or may be transferred to the memory 36 .
  • the output pad 34 may be a pad for applying a driving signal and/or a data signal to the display panel 20 .
  • the display device 100 may receive display data from an outside.
  • the display data may be data that is used to display an image or a picture on the display panel 20 .
  • the driving IC 30 may confirm numerical data stored in the counter. Thereafter, the display device 100 may receive the display data and a first error correction code (ECC) of the display data.
  • ECC error correction code
  • the error correction code may be, for example, a parity code or a CRC (Cycle Redundancy Checking) code.
  • the received display data and first error correction code may be stored in a register of the memory 36 .
  • the driving IC 30 may generate a second error correction code based on the display data stored in the register. Thereafter, the driving IC 30 may compare the first error correction code stored in the register with the generated second error correction code.
  • the first error correction code and the second error correction code may be equal to each other. If an error occurs in the process where the display device 100 receives the display data from the outside, the first error correction code and the second error correction code may be different from each other.
  • the driving IC 30 may change the numerical data stored in the counter. For example, the driving IC 30 may increase the value of the numerical data stored in the counter.
  • the display device 100 may repeat the process of receiving the display data and the first error correction code of the display data from the outside. Further, if an error occurs in the process where the display device 100 receives the display data from the outside during repetition of the above-described process, the driving IC 30 may increase the value of the numerical data stored in the counter up to the frequency of the occurrence.
  • the display device 100 may compare first numerical data stored in the counter before the display device 100 receives the display data from the outside with second numerical data stored after the whole receiving process is completed.
  • the first numerical data and the second numerical data may be equal to each other. If an error has occurred while the display device 100 repeats the process of receiving the display data from the outside, the first numerical data and the second numerical data may be different from each other.
  • the result of comparing the numerical data stored in the counter before and after the display data is received from the outside may indicate whether the error occurs during the reception of the display data from the outside. Accordingly, the error can be detected based on the result of comparing the first numerical data with the second numerical data. In this case, a user or an inspector can detect the error occurrence by conforming only whether the numerical data stored in the counter is changed without the necessity of verifying individual bits of the display data that the display device 100 has received from the outside.
  • Partial data of the display data received by the display device 100 through the above-described process may be stored in the memory 36 of the driving IC 30 .
  • the data may be stored in the OTP memory or MTP memory of the memory 36 .
  • the display device 100 may store in the memory 36 not only the display data that is the data used to display an image or a picture on the display panel 20 , but also the first CRC (Cycle Redundancy Checking) code of the display data.
  • the first CRC code may be received from the outside.
  • the CRC code may be used to determine whether the data stored in the memory 36 is accurately stored, that is, whether the data is stored without error.
  • the CRC code is used.
  • the error correction code is not limited thereto, i.e., various kinds of error correction codes may be used.
  • the driving IC 30 may load the display data stored in the memory 36 and generate the second CRC code of the display data.
  • the driving IC 30 may compare the first CRC code with the second CRC code.
  • the first CRC code is the CRC code of the display data before the display data is stored in the memory 36 and the second CRC code is the CRC code of the display data read from the memory 36 after the display data is stored in the memory 36 . Accordingly, if the display data is stored in the memory 36 without error, the first CRC code and the second CRC code are equal and, if an error occurs when the display data is stored in the memory 36 , the first CRC code and the second CRC code are different from each other. Accordingly, when the first CRC code and the second CRC code are different, the driving IC 30 may determine that the error has occurred.
  • the driving IC 30 may inscribe the result of the comparison of the first CRC code with the second CRC code in an error inscription register as an error flag.
  • the error inscription register may be positioned in the memory 36 or may be positioned in the driving circuit unit 35 . If the first CRC code and the second CRC code are different from each other as the result of the comparison of the first CRC code with the second CRC code, the driving IC 30 may inscribe the error flag. In some embodiments, if the first CRC code and the second CRC code are different from each other, the error flag may be set to “1”, and if the first CRC code and the second CRC code are equal to each other, the error flag may be set to “0”.
  • the error can be detected based on the result of comparison of the first CRC code with the second CRC code.
  • a user or an inspector may confirm whether the error has occurred by confirming only the value of the error flag inscribed in the error inscription register without the necessity of loading a display data mode stored in the memory 36 .
  • the error flag is set to “1”, and if the first CRC code and the second CRC code are equal to each other, the error flag is set to “0”, the user or the inspector may determine that the error has occurred in the display data in the process of storing the data in the memory 36 if the value of the error flag confirmed by the user or the inspector is “1” and may determine that the error has not occurred in the display data in the process of storing the data in the memory 36 if the value of the error flag confirmed by the user or the inspector is “0”.
  • the display device 100 can detect the error without verifying individual bits of the display data received from the outside. Verifying individual bits of the display data received from the outside to confirm whether the error has occurred requires a considerable amount of time. However, since the display device according to an embodiment can detect whether the error has occurred by confirming only whether the numerical data stored in the counter register has been changed without individually verifying bits of the received display data, the amount of time can be reduced or minimized.
  • the error can be detected without loading the whole display data stored in the memory.
  • the display device compares only an error code, e.g., the CRC code value, without loading the whole display data stored in the memory, the loss of time that is required to confirm whether the error has occurred can be reduced or minimized.
  • the loss of time can be minimized since the user or the inspector can confirm whether the error has occurred by confirming only the error flag of the error inscription register without loading the whole display data stored in the memory.
  • FIG. 3 is a flowchart illustrating a method of detecting an error in a display device according to an embodiment.
  • FIG. 3 illustrates processes in which the display device 100 detects whether an error has occurred during reception of the display data from the outside.
  • a confirmation operation (S 20 ) confirming the numerical data stored in the counter register may be performed.
  • a reception operation (S 21 ) receiving the display data and the first error correction code of the display data from the outside may be performed.
  • a generation operation (S 22 ) generating the second error correction code based on the received display data may be included. Since the method of generating the second error correction code is the same as described above, the description thereof will not be repeated.
  • a first comparison operation (S 23 ) comparing the received first error correction code with the generated second error correction code to provide a first comparison result may be included.
  • a changing operation (S 24 ) changing the numerical data stored in the counter register based on the first comparison result may be included. Since the method of changing the numerical data is the same as described above, the description thereof will not be repeated.
  • a repetition operation (S 25 ) repeating the reception operation to the changing operation at least once may be included. However, the repetition operation (S 25 ) may be omitted.
  • a second comparison operation (S 26 ) comparing the numerical data stored in the counter register with the numerical data confirmed in the confirmation operation to provide a second comparison result may be included.
  • a detection operation (S 27 ) detecting the error based on the second comparison result may be included.
  • the changing operation (S 24 ) to the second comparison operation (S 26 ) may be omitted.
  • the detection operation (S 27 ) may detect the error based on the first comparison result. Since the method of detecting the error is the same as described above, the description thereof will not be repeated.
  • FIG. 4 is a flowchart illustrating a method of detecting an error in a display device according to an embodiment.
  • FIG. 4 illustrates a process of detecting whether an error has occurred while the display data after detecting the error in the processes illustrated in FIG. 3 is stored in the OTP memory or the MTP memory of the memory 36 .
  • the display data and the first CRC code of the display data are stored in the memory (S 30 ). Since the storing of the display data and the first CRC code of the display data is substantially the same as the storing of the display data and the first CRC code illustrated in FIGS. 1 and 2 , the duplicate description thereof will not be repeated.
  • the second CRC code of the display data is generated by loading the display data stored in the memory (S 31 ).
  • the generation of the second CRC code may include the generation of the second CRC code inside the driving IC. Since the generation of the second CRC code is substantially the same as the generation of the second CRC code illustrated in FIGS. 1 and 2 , the duplicate description thereof will be omitted.
  • Comparing the first CRC code with the second CRC code may include the comparing of the first CRC code with the second CRC code inside the driving IC. Further, comparing of the first CRC code with the second CRC code may include the inscribing the comparison result of the first CRC code with the second CRC code in the error inscription register as the error flag. Since comparing the first and second CRC codes with each other is substantially the same as comparing the first and second CRC codes with each other in FIGS. 1 and 2 , the duplicate description thereof will not be repeated.
  • Detecting of the error may include confirming whether the error has occurred during storing of the display data in the memory by confirming the error flag of the error inscription register. Detecting the error is substantially the same as detecting the error illustrated in FIGS. 1 and 2 , the duplicate description thereof will not be repeated.
  • the error can be detected without loading the whole display data stored in the memory.
  • a considerable loss of time may occur.
  • the display device according to an embodiment compares only an error code, e.g., a CRC code, without loading the whole display data stored in the memory, the loss of time that is required to confirm whether the error has occurred can be reduced or minimized.
  • the user or the inspector can confirm whether the error has occurred by confirming only the error flag of the error inscription register without loading the whole display data stored in the memory, the loss of time can be minimized.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Probability & Statistics with Applications (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Quality & Reliability (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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